How to make a better device Good performance faster and less power consumed Low cost more compact and use less area

Electrical behavior of cmos Steady-state behavior when output is hold on 1 or 0 Dynamic behavior when output is changing

电子科技大学：《VHDL语言与数字集成电路设计》数字逻辑3-1

Codes in binary system BCD codes: for decimal digit Gray code: for numbers in binary system; AsCIi code: for characters ey point Use n bits. we can make 2n different words: To make n code-words. you must use logn bits

Representations of signed numbers In binary systems, an n-bit string can represent 2n different numbers 01234567

Chapter 2 Number systems and codes Positional number system representation and conversion Representations of negative numbers BCD codes and gray code

Chapter 1: Introduction From analog to digital Digital circuits and devices Design for IC The target of the text The arrangement of the text

用户定义数据类型 VHDL允许用户自行定义类型; 自定义类型的元素实际上全部来自预定义类型 用户定义类型必须在使用以前进行类型说明; 用户定义类型可以分为子类型、枚举类型和数 组3类;

构造体语法要点 每个构造体必须属于一个实体; 每个构造体必须有一个名称: 通常可以根据描述方式起名: str rtl beh 构造体分为两部分: is- bigin:说明语句 bigin-end:并行语句;

全方位硬件描述—从系统到电路 多种描述方式—适应层次化设计 数据类型丰富，语法严格清晰 串行和并行通用，物理过程清楚 与工艺结构无关，可用于各类EDA工具